Verify the NooBaa DB PostreSQL version at upgrade

[sagihirshfeld]

Noticeable changes made:

1. Added three util functions:

• get_nb_db_psql_version_from_image: extract the version from the image name in the noobaa-db-pg statefulset. The equivalent of:

 oc -n openshift-storage get statefulsets.apps noobaa-db-pg -o yaml | grep image:

    image: .../postgresql-12@sha256:28ab5b075817fb23ac1b8619371c858d39205d962309de35dea4434a95d67ee2

• query_nb_db_psql_version: Extract the version from the DB itself. The equivalent of:

$ oc -n openshift-storage exec noobaa-db-pg-0 -- psql -t  -c "SELECT substring(version() from 'PostgreSQL ([0-9\.]+)')"
15.6

• get_expected_nb_db_psql_version: Extract the PostreSQL version that's listed at the NooBaa CR, which by the noobaa-db reocvery KCS, seems to set the expectation. This util function is the equivalent of the following command:

oc -n openshift-storage get noobaa noobaa -o jsonpath='{$.spec.dbImage}'
.../postgresql-15@sha256:e0e8977ab6bd347218a3c8da305ebe75bfd2483c63fb63a93147051684626e88

2. Added the verify_nb_db_psql_version helper function, and added it to the verification in run_ocs_upgrade.

3. Added a libtest to test verify_nb_db_psql_version

[openshift-ci]

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This pull-request has been approved by: sagihirshfeld

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[ocs-ci]

PR validation on existing cluster

Cluster Name: shirshfe-417ibm29
Cluster Configuration:
PR Test Suite:
PR Test Path: tests/libtest/test_nb_db_psql_version.py
Additional Test Params:
OCP VERSION: 4.17
OCS VERSION: 4.17
tested against branch: master

Job PASSED.